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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第4期    总第260期    2016年4月

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文章编号:1672-7207(2016)04-1327-11
高轴压比下BCCS高强混凝土柱拟静力试验研究
李升才1, 2

(1. 华侨大学 土木工程学院,福建 厦门,361021;
2. 华侨大学 福建省结构工程与防灾重点实验室,福建 厦门,361021
)

摘 要: 进行高轴压比下比例为1/2的9个密置焊接环式复合箍筋约束(BCCS)高强混凝土柱试件和1个对比试件的低周反复加载试验。研究轴压力比、配箍率和配箍形式对柱变形性能和滞回特征的影响。研究该类构件的破坏过程、破坏形态、滞回曲线、延性性能、耗能性能,分析塑性铰区域剪切变形角。研究结果表明:所有试件最终破坏均呈倒三角形的弯曲型破坏形态;塑性铰区域的剪切变形角较小,对试件弯曲变形的影响可忽略。在高轴压比下,全部BCCS高强混凝土柱试件都具有较饱满的滞回环,无明显的捏缩现象,表明这种柱的耗能性能较好;另外,随着轴压比的提高,其耗能性能降低,骨架曲线的强度下降段较陡,延性性能较差;随着箍筋间距的减小(配箍率的增大),其耗能性能提高,骨架曲线下降段愈平缓,延性性能愈好;与普通复合箍筋的对比试件相比较,BCCS效果更好,且延性性能更好,耗能更大。

 

关键字: 高轴压比;配箍率;BCCS高强混凝土柱;配箍形式;抗震性能

Pseudo-static test research on high strength concrete columns with butt-welded closed composite stirrups at high axial compression ratios
LI Shengcai1, 2

1. School of Civil Engineering, Huaqiao University, Xiamen 362021, China;
2. Key Laboratory of Structure Engineering and Disaster Reduction of Fujian Province,
Huaqiao University, Xiamen 362021, China

Abstract:For comparison purposes, nine specimens of high strength concrete columns confined with butt-welded closed composite stirrups and one specimen with ordinary binding stirrups of 1/2 scale model were tested under cyclic lateral loads and a higher constant axial load. The influence of axial compression ratio, volume-stirrup ratio and stirrup form to deformation performance and hysteretic characteristics of the columns was mainly considered in the test. The failure process, the failure modes, the characteristics of hysteresis loop behavior, the energy-dissipation capacity and ductility were observed, and the result of the shear deformation angle of plastic hinge region was analyzed as well. The results show that for all specimens, the failure mode is the inverted triangle bending failure modes, with a small shear deformation angle of plastic hinge region the effect of bending deformation can be ignored. At the high axial compression ratios, all hysteretic curves of the high strength concrete columns with butt-welded closed composite stirrups are full with no obvious pinch phenomenon. Hence the energy-dissipation capacity of the columns is good. In addition, all specimens at the high axial compression ratios with the increase of axial compression ratio exhibit that the energy- dissipation capacity of the specimens deteriorates. It is noted that the strength descending part of the moment-curvature skeleton curve gets steeper, and ductility becomes worse as the stirrup spacing decreases. However, as the energy-dissipation capacity of the specimens improves, the strength descending part of the moment-curvature skeleton curve gets flatter, and ductility becomes better. In comparison, all specimens with the confinement effect of butt-welded closed composite stirrups performed better than ordinary binding closed composite stirrups, and the energy- dissipation capacity of the specimens with butt-welded closed composite stirrups exhibits better results as well as higher ductility.

 

Key words: high axial compression ratios; volume-stirrup ratio; high strength concrete columns with butt-welded closed composite stirrups; stirrup form; seismic behavior

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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